Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/uralbox/public_html/vendor/guzzlehttp/promises/tests/UtilsTest.php:15 Stack trace: #0 {main} thrown in /home/uralbox/public_html/vendor/guzzlehttp/promises/tests/UtilsTest.php on line 15